JPH03127923A - Artificial fish reef - Google Patents

Abstract

PURPOSE:To make it possible to sink and provide an artificial fish reef capable of preventing fish net from being caught in stable state by forming the artificial fish reef into inclined face having no corner part on outer face and inclined to mutually same direction. CONSTITUTION:A rectangular through-windier 3 passed through the inside face 5 is formed in zigzag state in the outer face 4 of cylindrical fish reef body 1 made of concrete, having oval end face 2 being 1-3m in short diameter d1 and long diameter and 2-3m in length 1 and having 15-30cm thickness and a number of iron plate pieces 6 having 1-5mm rectangular band shape are arranged in rows toward axial direction at definite intervals in the outer face 4 and inner face of fish reef and as necessary both end faces 2 are formed into inclined face mutually inclined to opposite direction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an artificial reef, particularly formed of concrete,
- This relates to an artificial fish reef in which one or more reefs are sunk into the seabed for spawning, breeding, and growth of fish and shellfish.

[Prior art] Artificial reefs have been proposed and implemented in order to measure the spawning, reproduction, and growth of fish and shellfish in coastal fishing areas.
There are block-shaped objects made of concrete.

These concrete artificial fish reefs have a square or triangular shape with sharp corners on the outside, or have protrusions on the outside so that they can be stacked and used stably when placed on the seabed. is widely used.

[Problems to be Solved by the Invention] However, when an artificial fish reef having sharp corners or protrusions on its outer surface is left submerged on the seabed as described above, fishing nets and other fishing gear are likely to get caught in the corners or protrusions. Not only have fishing nets broken and left behind, covering the artificial reef and preventing fish and shellfish from swimming, it has lost its function as an artificial reef, but has also turned into a so-called hole fishing ground where fish and shellfish cannot approach. The number is increasing. There is also the problem that breaking expensive fishing nets or leaving them on the seabed can result in significant economic losses.

The present invention has been made in view of these problems, and it is possible to sink it into the seabed in a stable state, and it can function as an artificial reef for many years without worrying about fishing nets or other fishing gear getting caught. The purpose of this invention is to provide an artificial reef that can exhibit the following effects.

[Means for Solving the Problems] The present invention has firstly a structure in which the outer surface is formed of concrete into a flat cylindrical shape with no corner portions, and secondly a structure in which the outer surface is formed in a semicylindrical shape with concrete. Thirdly, in each of the above-mentioned configurations, the outer surface has no corner portions and the inner surface is formed into a concave semi-cylindrical shape with a chevron-shaped end. A structure in which both end faces are formed as inclined surfaces in the opposite directions, a structure in which a large number of strip-shaped iron plate pieces are attached to the wall surface at appropriate intervals, and a structure in which a large number of transparent windows are formed in the wall surface. This configuration is a means for solving the above problem.

[Function] The outer surface has no corner portions, and both end surfaces are formed into inclined surfaces that slope in the same direction to prevent fishing nets from being caught when the device is sunk on the seabed. Also,
By forming it into a flat cylindrical shape, a semi-cylindrical shape with a semicylindrical shape, or a semi-cylindrical shape with a chevron-shaped end, it can be submerged in a stable state.

In addition, the iron plate pieces enable diatoms to grow and microorganisms to inhabit from the early stage of submergence, creating an environment suitable for fish and shellfish to live in a short period of time. Furthermore, the multiple transparent windows improve the passage of seawater, exhibiting a tidal current dampening effect, allowing fish and shellfish to swim freely through the artificial reef, and eliminating stagnation of seawater inside the artificial reef. Measure the presence of microorganisms that serve as food.

[Example] Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIGS. 1 to 3 show a first embodiment of the present invention, in which the fish reef body l has a short axis dl of 1 to 3 m and a long axis d2, for example.
has an elliptical end surface 2, and has a length of, for example, 2 m.
It is formed of concrete into a cylindrical shape with a length of about 3 m and a wall thickness of about 15 to 30 cm.

Furthermore, rectangular transparent windows 3 penetrating the inner surface 5 are arranged on the outer surface 4 in a staggered manner. Furthermore, the outer surface 4 and the inner surface 5
A large number of short strip-shaped iron plate pieces 6 having a thickness of about 1 to 5 mm are fixed at regular intervals in the axial direction by an appropriate means such as adhesive or bolts, and a large number of rows are fixed at appropriate circumferential intervals. are installed in parallel. These iron plate pieces 6
The rows are arranged alternately with the rows of transparent windows 3.

The artificial color (6A) having the configuration shown in this embodiment is made into a fish reef by placing one or a plurality of pieces in combination on the seabed 7 with the major axis d2 parallel to the surface of the seabed 7 in the same way as conventional artificial reefs. When a plurality of pieces are combined and laid down, for example, they are stacked in bales as shown in Fig. 2.

According to this embodiment, each artificial color @A has an elliptical end face and is sunk with its major axis d2 parallel to the surface of the seabed 7, so it does not roll like an artificial reef with a circular end face, for example. After they are deposited, they are in an extremely stable state, and there is no need to worry about them being moved by waves or currents, or collapsing when stacked in multiple tiers.The flatter the ellipse, the more stable the ellipse becomes.

Furthermore, in this embodiment, the transparent windows 3 formed in each artificial reef A serve as passages for seawater to reduce resistance, allowing a more stable state to be maintained and a wave-dissipating effect to be expected.

Furthermore, in this embodiment, since the iron plate pieces 6 are attached to the outer surface 4 in a slightly protruding state, when the artificial reefs A are stacked on the seabed 7, they face each other in the vertical direction as shown in FIG. The iron plate pieces 6 attached to the artificial reef to be placed mesh with each other and restrict movement in the major axis d2 direction, making it possible to more effectively prevent displacement and collapse.

Furthermore, since this embodiment does not have sharp corners on the outer surface 4, there is no risk of fishing nets or fishing gear getting caught.

After sinking, diatoms necessary for the spawning and growth of fish and shellfish grow on the numerous iron plate pieces 6 attached to the outer surface 4 and inner surface 5 until the alkaline components in the concrete are leached. Because microorganisms live there, an environment suitable for fish and shellfish can be created in a short period of time, allowing it to function as a fish reef. In general, the surface of an artificial fish reef remains highly alkaline for several years due to the alkaline components in the concrete, resulting in the growth of diatoms and other microorganisms that are essential for the growth of juvenile seafood. However, if iron is present on the surface, it is possible for diatoms and other microorganisms to colonize and inhabit the iron-rich areas immediately after they are deposited, as disclosed in JP-A-58-7603.
This is a well-known fact as disclosed in Publication No. 2 and Japanese Patent Application Laid-open No. 1336/1983.

On the other hand, in this embodiment, the transparent window 3 has a tidal current damping effect in order to improve the passage of seawater, allows fish and shellfish passing through the artificial reef A to swim freely, and eliminates stagnation of seawater inside. It is possible to improve the function of a fish reef by measuring the habitat of fish and shellfish and the microorganisms that feed on them, and it also has the effect of conserving resources by reducing the consumption of concrete.

In this embodiment, the iron plate piece 6 is attached to the outer surface 4 of the fish reef body l in a state that protrudes by the thickness, but since the thickness of the iron plate piece 6 is about several III meters, it can be used for fishing nets, etc. But it never gets caught.

If necessary, the iron plate piece 6 may be embedded so that its surface is flush with the outer surface 4 of the reef body l.

(Second Embodiment) FIGS. 4 and 5 show a second embodiment of the present invention, and the overall structure, operation, and effect are almost the same as those of the first embodiment, but the outer surface 4 is The difference is that a plurality of attached strip-shaped iron plate pieces 5 are arranged in a winding shape at appropriate intervals.

Therefore, as shown in Fig. 5, by stacking a plurality of artificial reefs A with their central axes perpendicular to each other, movement of each artificial reef A in the axial direction and in a direction perpendicular to this is restricted. , can form extremely stable multi-tiered fish reefs.

(Third Embodiment) FIG. 6 shows a third embodiment of the present invention, and the overall structure, operation, and effect are almost the same as those of the first embodiment, but both end surfaces 2a, 2a are opposite. It differs in that it is formed on an inclined surface that slopes in the direction of.

Therefore, since the outer surface 4 and the end surfaces 2a, 2a have no corner portions, there is no fear that fishing nets or the like will get caught.

In this example, when a large number of artificial fish reefs are piled up in multiple stages and deposited, the left and right edges on the front side are continuous without forming corners or convex parts, as shown in Figure 7. An artificial reef AI having an end face 2 and a length such that
A2. It is better to use A3.

(Fourth Embodiment) FIGS. 8 and 9 show a fourth embodiment of the present invention, and the overall structure, operation, and effects are almost the same as those of the first embodiment, but the reef body l It is different in that it is formed into a cylindrical shape.

This embodiment is used in the same manner as the first embodiment, but
As shown in FIG. 9, since a flat portion 8 is formed on the lower surface, it can be placed in a more stable state. Also,
In this embodiment, as in the third embodiment, the end face 2.2
can be an inclined surface.

(Fifth Embodiment) FIGS. 10 to 12 show a fifth embodiment of the present invention, in which the reef body 1 has a height h of, for example, 1 to 1. ．． 5m,
The opening width fl1 is about 1 to 3 m, the wall thickness is about 15 to 30 cm, the outer surface 9 has no corners, the inner surface lO is formed in a concave shape, and the length J22 is made of concrete with a length of, for example, about 2 to 3 m. It is shaped like a cylinder.

Further, as in the first embodiment, rectangular transparent windows 3 penetrating the inner surface 10 are arranged on the outer surface 9 in a staggered manner.

Furthermore, on the outer surface 9 and the inner surface IO, there is a short strip of 1 to 5 mm.
A large number of iron plate pieces 6 having a certain thickness are fixed at regular intervals in the axial direction by an appropriate means such as adhesive or bolts, and a large number of rows are arranged in parallel at appropriate circumferential intervals. There is.

The artificial reef A having the structure shown in this embodiment is made into a fish reef by sinking one piece or a plurality of pieces in combination on the seabed in the same manner as conventional artificial reefs. In particular, when a plurality of artificial fish reefs A are stacked and deposited, for example, as shown in FIG. By using this, it is possible to stack them in a stable state. In addition, the functions and effects of this embodiment are almost the same as those of the first and fourth embodiments, but since the reef body l is semi-cylindrical, it can be formed with less concrete, which saves resources. It is extremely advantageous in terms of

In this embodiment, the outer surface 9 has a gentle chevron shape, but it may have other shapes such as an arc shape as long as it does not have sharp corners that may cause fishing nets to get caught. Also, in this embodiment, as in the third embodiment, the end faces 2,
It is also possible for 2 to be an inclined surface.

[Effects of the Invention] As described above, the present invention has no corners or protrusions on the outer surface, so there is no fear that fishing nets or gear will be caught and left behind when the layer is sunk on the seabed, and it can be used as a fish reef. It is possible to perform its functions for many years, and there is no economic burden due to loss of expensive fishing nets or fishing gear.
The main body of the fish reef is formed into a flat cylinder shape, a semi-cylindrical shape with a semi-cylindrical shape, or a semi-cylindrical shape with a chevron-shaped end face, so it can be submerged in a stable state, and there is no fear of it collapsing even when stacked in multiple stages.
Furthermore, if iron plate pieces are installed, this allows diatoms to grow and microorganisms to inhabit the area from the early stage of the installation, so it can be used as a fish reef at an early stage without waiting for the alkaline components of the concrete to finish leaching. function can be demonstrated. Furthermore, since multiple transparent windows are formed that penetrate from the outer surface to the inner surface, the multiple transparent windows improve the passage of seawater, exhibiting a tidal current damping effect, and allowing fish and shellfish to swim freely as they pass through the artificial reef. In addition, it is possible to further improve the function of a fish reef by eliminating stagnation of seawater inside and allowing the habitat of fish and shellfish as well as the microorganisms that feed on them.In addition, it is possible to further improve the function of a fish reef by reducing the consumption of concrete. It's also effective.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is an end view showing the state of use,
FIG. 3 is an enlarged partial view of FIG. 2, FIGS. 4 and 5 show a second embodiment of the present invention, and FIG. 4 is a perspective view;
FIG. 5 is a perspective view showing the state of use, FIGS. 6 and 7 show a second embodiment of the present invention, FIG. 6 is a perspective view, and FIG. 7 is a front view showing the state of use. 8 and 9 show a fourth embodiment of the present invention, FIG. 8 is a perspective view, FIG. 9 is a perspective view showing the state of use, and FIGS.
2 shows a fifth embodiment of the present invention, FIG. 1O is a perspective view, FIG. 11 is an end view showing the state of use, and FIG. 12 is an enlarged partial view of a different embodiment. 2... End face, 3... Transparent window, 4... External surface, 5... Inner surface. 6... Iron plate piece, 9... External surface, lO... Inner surface.

Claims (1)

[Scope of Claims] 1. An artificial fish reef characterized in that the outer surface is formed of concrete into a flat cylindrical shape with no corner portions. 2. An artificial fish reef characterized by being formed into a cylindrical shape made of concrete. 3. An artificial fish reef characterized by being formed of concrete into a semi-cylindrical shape with a chevron-shaped end, the outer surface of which has no corner portions, and the inner surface of which is concave. 4. The artificial reef according to any one of claims 1, 2, and 3, wherein both end faces are formed as inclined surfaces that are inclined in opposite directions. 5. The artificial reef according to claim 1, wherein a plurality of iron plate pieces are attached to the surface at appropriate intervals. 6. The artificial reef according to any one of claims 1, 2, and 3, wherein a plurality of transparent windows penetrating from the outer surface to the inner surface are formed.